package com.spzx.order.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.spzx.cart.api.RemoteCartService;
import com.spzx.cart.api.domain.CartInfo;
import com.spzx.common.core.constant.SecurityConstants;
import com.spzx.common.core.context.SecurityContextHolder;
import com.spzx.common.core.domain.R;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.common.core.utils.StringUtils;
import com.spzx.common.core.utils.bean.BeanUtils;
import com.spzx.common.core.utils.uuid.UUID;
import com.spzx.common.rabbit.constant.MqConst;
import com.spzx.common.rabbit.service.RabbitService;
import com.spzx.order.api.domain.OrderInfo;
import com.spzx.order.api.domain.OrderItem;
import com.spzx.order.domain.OrderLog;
import com.spzx.order.domain.vo.OrderForm;
import com.spzx.order.domain.vo.TradeVo;
import com.spzx.order.mapper.OrderInfoMapper;
import com.spzx.order.mapper.OrderItemMapper;
import com.spzx.order.mapper.OrderLogMapper;
import com.spzx.order.service.IOrderInfoService;
import com.spzx.product.api.RemoteProductService;
import com.spzx.product.api.domain.vo.SkuLockVo;
import com.spzx.product.api.domain.vo.SkuPrice;
import com.spzx.user.api.RemoteUserAddressService;
import com.spzx.user.domain.UserAddress;
import org.jetbrains.annotations.NotNull;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.autoconfigure.management.ThreadDumpEndpointAutoConfiguration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@Service
public class OrderInfoServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfo> implements IOrderInfoService {
    @Autowired
    private OrderInfoMapper orderInfoMapper;

    @Autowired
    private OrderItemMapper orderItemMapper;

    @Autowired
    private OrderLogMapper orderLogMapper;

    @Autowired
    private RemoteCartService remoteCartService;

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RemoteProductService remoteProductService;

    @Autowired
    private RemoteUserAddressService remoteUserAddressService;

    @Autowired
    RabbitService rabbitService; //来自于公共模块：spzx-common-rabbit
    @Autowired
    private ThreadDumpEndpointAutoConfiguration threadDumpEndpointAutoConfiguration;

    /**
     * 查询订单列表
     *
     * @param orderInfo 订单
     * @return 订单
     */
    @Override
    public List<OrderInfo> selectOrderInfoList(OrderInfo orderInfo) {
        return orderInfoMapper.selectOrderInfoList(orderInfo);
    }

    /**
     * 查询订单
     *
     * @param id 订单主键
     * @return 订单
     */
    @Override
    public OrderInfo selectOrderInfoById(Long id) {
        OrderInfo orderInfo = orderInfoMapper.selectById(id);
        List<OrderItem> orderItemList = orderItemMapper.selectList(new LambdaQueryWrapper<OrderItem>().eq(OrderItem::getOrderId, id));
        orderInfo.setOrderItemList(orderItemList);
        return orderInfo;
    }


    @Override
    public TradeVo orderTradeData() {

        Long userId = SecurityContextHolder.getUserId();


        R<List<CartInfo>> cartCheckedListResult = remoteCartService.getCartCheckedList(userId, SecurityConstants.INNER);
        if (R.FAIL == cartCheckedListResult.getCode()) {
            throw new ServiceException(cartCheckedListResult.getMsg());
        }

        List<CartInfo> cartInfoList = cartCheckedListResult.getData();
        if(CollectionUtils.isEmpty(cartInfoList)){
            throw new ServiceException("购物车中没有选中商品");
        }



        //1.获取订单项集合
        List<OrderItem> orderItemList = cartInfoList.stream().map(cartInfo->{
            OrderItem orderItem = new OrderItem();
            BeanUtils.copyProperties(cartInfo,orderItem);
            return orderItem;
        }).toList();


        //2.获取交易总金额
        BigDecimal totalAmount = new BigDecimal(0);
        for (OrderItem orderItem : orderItemList) {
            totalAmount = totalAmount.add(orderItem.getSkuPrice().multiply(new BigDecimal(orderItem.getSkuNum())));
        }

        //3.生成交易流水号
        String tradeNo = generateTradeNo(userId);

        TradeVo tradeVo = new TradeVo();
        tradeVo.setOrderItemList(orderItemList);
        tradeVo.setTotalAmount(totalAmount);
        tradeVo.setTradeNo(tradeNo);//交易流水号
        return tradeVo;
    }

    @NotNull
    private String generateTradeNo(Long userId) {
        String tradeNo = UUID.randomUUID().toString().replaceAll("-", "");
        String userTradeKey = "user:tradeNo:" + userId;
        redisTemplate.opsForValue().set(userTradeKey, tradeNo, 5, TimeUnit.MINUTES);
        return tradeNo;
    }


    @Override
    public Long submitOrder(OrderForm orderForm) {
        Long userId = SecurityContextHolder.getUserId();
        String userTradeKey = "user:tradeNo:" + userId;
    //1.去重
        //代码1： 这种不具有原子性，不能用于生产环境。
/*        String tradeNoFromForm = orderForm.getTradeNo();
        String tradeNoFromRedis = (String)redisTemplate.opsForValue().get(userTradeKey); //5分钟有效
        if(!tradeNoFromForm.equals(tradeNoFromRedis)){
            throw new ServiceException("请不要重复提交订单");
        }
        redisTemplate.delete(userTradeKey);*/

    //代码2：通过LUA脚本保证判断和删除 具有原子性。
        String script = "if redis.call('get',KEYS[1]) == ARGV[1]\n" +
                "then\n" +
                "    return redis.call('del',KEYS[1]);\n" +
                "else\n" +
                "    return 0;\n" +
                "end;";

        String tradeNoFromForm = orderForm.getTradeNo();
        DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>(script,Long.class);
        Long result = (Long)redisTemplate.execute(redisScript, Arrays.asList(userTradeKey), tradeNoFromForm);
        if(result == 0){
            throw new ServiceException("请不要重复提交订单");
        }

        //2.验证数据
        List<OrderItem> orderItemList = orderForm.getOrderItemList();
        if(CollectionUtils.isEmpty(orderItemList)){
            throw new ServiceException("数据为空不能下单");
        }

    //3.校验价格是否变动：变动不能下单，更新购物车价格； 不变动可以下单
        //3.1 获取数据库最新商品价格
        List<Long> skuIdList = orderItemList.stream().map(OrderItem::getSkuId).toList();
        R<List<SkuPrice>> skuPriceListResult = remoteProductService.getSkuPriceList(skuIdList, SecurityConstants.INNER);
        if(skuPriceListResult.getCode() == R.FAIL){
            throw new ServiceException(skuPriceListResult.getMsg());
        }
        List<SkuPrice> skuPriceList = skuPriceListResult.getData(); //商品最新价格
        Map<Long, BigDecimal> skuIdToSalePriceMap = skuPriceList.stream().collect(Collectors.toMap(SkuPrice::getSkuId, SkuPrice::getSalePrice));
        StringBuilder builder = new StringBuilder();
        for (OrderItem orderItem : orderItemList) {
            if(orderItem.getSkuPrice().compareTo(skuIdToSalePriceMap.get(orderItem.getSkuId())) != 0){
                builder.append("[").append(orderItem.getSkuName()).append("]价格有变动;");
            }
        }

        if(!StringUtils.isEmpty(builder.toString())){ //存在价格变动抛异常,取消下单
            //更新购物车商品价格
            remoteCartService.updateCartPrice(userId, SecurityConstants.INNER);
            throw new ServiceException(builder.toString());
        }

    //4.检查并锁定库存
        List<SkuLockVo> skuLockVoList = orderItemList.stream().map(item -> {
            SkuLockVo skuLockVo = new SkuLockVo();
            skuLockVo.setSkuId(item.getSkuId());
            skuLockVo.setSkuNum(item.getSkuNum());
            return skuLockVo;
        }).collect(Collectors.toList());

        String checkAndLockResult = remoteProductService.checkAndLock(orderForm.getTradeNo(), skuLockVoList, SecurityConstants.INNER).getData();
        if(StringUtils.isNotEmpty(checkAndLockResult)) {
            throw new ServiceException(checkAndLockResult);
        }
        //checkAndLockResult==""  表示检查与锁定库存成功。
        //5.保存订单
        Long orderId = null;
        try {
            orderId = this.saveOrder(orderForm);
        } catch (Exception e) {
            //下单失败：解锁库存
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderForm.getTradeNo());
            throw new ServiceException("下单失败");
        }

   //6.删除购物车选中商品
        remoteCartService.deleteCartCheckedList(userId,SecurityConstants.INNER);

    //7.发送延迟消息,取消订单 (15分钟未支付，消费者就会进行关闭订单->解锁库存。)
        rabbitService.sendDelayMessage(MqConst.EXCHANGE_CANCEL_ORDER,
                MqConst.ROUTING_CANCEL_ORDER,
                String.valueOf(orderId), MqConst.CANCEL_ORDER_DELAY_TIME);


        return orderId;
    }

    @Transactional
    public Long saveOrder(OrderForm orderForm) {
        Long userId = SecurityContextHolder.getUserId();
        String userName = SecurityContextHolder.getUserName();
        //1.保存订单基本信息
        OrderInfo orderInfo = new OrderInfo();
        orderInfo.setUserId(userId);
        orderInfo.setNickName(userName);
        orderInfo.setOrderNo(orderForm.getTradeNo()); //交易流水号作为订单号

        List<OrderItem> orderItemList = orderForm.getOrderItemList();
        BigDecimal totalAmount = new BigDecimal(0);
        for (OrderItem orderItem : orderItemList) {
            totalAmount = totalAmount.add(orderItem.getSkuPrice().multiply(new BigDecimal(orderItem.getSkuNum())));
        }
        orderInfo.setTotalAmount(totalAmount); //实付金额
        orderInfo.setOriginalTotalAmount(totalAmount); //商品总金额  不包括 运费 和 优惠价
        orderInfo.setFeightFee(orderForm.getFeightFee());
        //OrderInfo类的orderStatus属性的类型改为Integer
        orderInfo.setOrderStatus(0); //订单状态【0->待付款；1->待发货；2->已发货；3->待用户收货，已完成；-1->已取消】

        UserAddress userAddress = remoteUserAddressService
                .getUserAddress(orderForm.getUserAddressId(), SecurityConstants.INNER).getData();

        orderInfo.setReceiverName(userAddress.getName());
        orderInfo.setReceiverPhone(userAddress.getPhone());
        orderInfo.setReceiverTagName(userAddress.getTagName());
        orderInfo.setReceiverProvince(userAddress.getProvinceCode());
        orderInfo.setReceiverCity(userAddress.getCityCode());
        orderInfo.setReceiverDistrict(userAddress.getDistrictCode());
        orderInfo.setReceiverAddress(userAddress.getFullAddress());

        orderInfo.setRemark(orderForm.getRemark());

        orderInfo.setCouponAmount(new BigDecimal(0));   //优惠卷金额

        orderInfoMapper.insert(orderInfo); //主键回填   数据库分配主键

        //2.保存订单项信息
        for (OrderItem orderItem : orderItemList) {
            orderItem.setOrderId(orderInfo.getId());
            orderItemMapper.insert(orderItem);
        }

        //3.保存订单日志信息
        OrderLog orderLog = new OrderLog();
        orderLog.setOrderId(orderInfo.getId());
        orderLog.setOperateUser("用户");
        orderLog.setProcessStatus(0);
        orderLog.setNote("用户下单");
        orderLogMapper.insert(orderLog);

        return orderInfo.getId();
    }

    @Override
    public void processCloseOrder(long orderId) {
        OrderInfo orderInfo = orderInfoMapper.selectById(orderId);
        if (Objects.equals(orderInfo.getOrderStatus(),0) && orderInfo != null){
            orderInfo.setOrderStatus(-1);
            orderInfo.setCancelTime(new Date());
            orderInfo.setCancelReason("未支付自动取消");
            orderInfoMapper.updateById(orderInfo);

            OrderLog orderLog = new OrderLog();
            orderLog.setOrderId(orderId);
            orderLog.setOperateUser("系统");
            orderLog.setProcessStatus(-1);
            orderLog.setNote("系统取消订单");
            orderLogMapper.insert(orderLog);

            //解锁库存
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderInfo.getOrderNo());
        }
    }
}